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Mobile Phones/Cell Phones is the fundamental element in every moment or second in our life. But this most useable phone has some health effect that are...
Read articleProgramming languages are the foundation of software development and computer science. They provide a medium through which humans can instruct machines to perform specific tasks. Here’s...
Read articleAnd note some fundamentals of Promise – When you create a new Promise, you’re really just creating a plain old JavaScript object. This object can invoke...
Read articleThis tutorial teaches FIWARE users how to alter the context programmatically. The tutorial builds on the entities created in the previous stock management example and enables a user...
Read articleIn this file, you will write the functions that dispatch an action. These functions will be linked to your component props by the container’s mapDispatchToProps function....
Read articleA lifecycle hook that is called after Angular has fully initialized a component’s view. Define an ngAfterViewInit() method to handle any additional initialization tasks. interface AfterViewInit...
Read articleAggregation in MongoDB is nothing but an operation used to process the data that returns the computed results. Aggregation basically groups the data from multiple documents...
Read articleFiber, the new React reconciliation algorithm, has the ability to start and stop rendering as needed for performance benefits. One of the trade-offs of this is...
Read articleFirst a re-cap of the basic CSS Chain/Descendant Selector 1> Chain Selectors – https://stackoverflow.com/questions/13444647/css-class-definition-with-multiple-identifiers .class1.class2 will match only the elements that have both of the classes defined....
Read articleBasically, the Company asked to create an Android “screen” that would allow a user to enter and submit the following data from an American Express, Discover,...
Read articleAccording to original Documentation the pipable operator is that function take observables as a input and it returns another observable .previous observable stays unmodified. pipe(...fns: UnaryFunction<any,...
Read articleOne of the main goals of Angular is to help the developer create reusable and composable components. I think ng-content is one of the simplest ways...
Read articleKeys in React are utilised to identify specific Virtual DOM Elements that have changed. The classic example of usage of keys is a list. Keys are...
Read articleWhat are the approaches to include polyfills in your create-react-app? There are approaches to include polyfills in create-react-app, Manual import from core-js: Create a file called...
Read articlethis.props.history.push(“/”) Official Doc Effectively this is the most common way to implement redirect after a successful form submission. Use case in my MERN book library repo onSubmit = (e)...
Read articleConverting a class-based component to Functional Component class TableRowWrapper extends Component { render() { return <tr>{this.props.children}</tr>; } } Now the functional version of the above component...
Read articleThe most common implementation of this is as follows to capture the change of event for typing in a form (a login form for example) handleChange(event)...
Read articleVery simply its passing an object as an argument to the function, but the destructuring uses only the named properties of the object. const destructuring =...
Read articleWithout using the destructuring syntax getting multiple values out of an array can be quite cumbersome. You would do something like this: const items = ['car',...
Read articleA large part of React is this idea of having components control and manage their own state. What happens when we throw native HTML form elements...
Read articleOne simple use case for implementing this React context API Have you ever experienced the pain of trying to get state from the top of your...
Read articleReact is magical, but it still can’t get around the fact that we must build a DOM for the user to see anything. Building a DOM...
Read articleThe virtual DOM is a tree based on JavaScript objects created with React that resembles a DOM tree. Each time you need to change something in...
Read articleRendering a will navigate to a new location. The new location will override the current location in the history stack, like server-side redirects (HTTP 3xx) do....
Read articleAll return values need to be wrapped in a div. This is because a component can only return one single element, and if you want more...
Read articleTechnical interviews may also include time where the developer is asked to look at (and probably write) some code. Hence, take a look at the code...
Read articleStandard way to define class class Counter extends Component { constructor (props) { super(props) this.state = { counter: 0, } // I have to bind these...
Read articleFirst off, let me express that this is generally not the way to go about things in React land. Usually what you want to do is...
Read articleLets look at the Redux Source Code https://github.com/reduxjs/redux/blob/9d3273846aa8906d38890c410b62fb09a4992018/src/combineReducers.ts#L197 let hasChanged = false const nextState: StateFromReducersMapObject<typeof reducers> = {} for (let i = 0; i < finalReducerKeys.length;...
Read articleA cool feature that Jest has is snapshots. This takes a snapshot of your component and how it renders and then will compare that whenever doing...
Read articleWhen writing unit tests for React, shallow rendering can be helpful. Shallow rendering lets you render a component “one level deep” and assert facts about what...
Read articleThe main thing you need to understand about Styled Components is that its name should be taken quite literally. You are no longer styling HTML elements...
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